Hi Stefan,
in the meantime I bought 5 used iPhone 5S at ebay to use them as Webcams (around 50€ each). The issue persists. My Internet here has 25Kbit downstream and 5Kbit upstream. Depending on the icam pro device i use, I get the 4x4 or the 3x3 grid. Older devices like my ipad mini 4 (still selling!) get the 3x3 grid, but are not able to receive all 9 cams. mostly they get 6...7 cams, sometimes 8. The newer devices like my ipad pro 10.5 or my iphone 8 plus get a 4x4 grid, and they get 7...8 cams, in lucky cases also 9.
There seems to be a issue with the icam server and the handshake. The faster the device, the more cams come on the price that he sees fake ams (and count wrong).
two of my cams have only 2 bar WIFI signal and the have a reduced framerate (maybe 0,5...1 image per sec). But they are still there, also other cams are missing, which have 3 bars signal. its very random.
All these problems are independent, how many icam pro viewing stations i use. if I switch off all, except one, the issue is the same.
Another thing: if I go on my iphone 8plus from wifi (4x4 pattern) to 4G (LTE) than i get the 3x3 pattern, but more cams are missing.
Another annoying issue: I jus buyed your 4,99USD monthly plan. Sometimes there is a popup to buy another.
Maybe this helps to find out where the problem is...
Claus, Germany